Deterministic displayer integration tests

[mariusmihaic]

Reasoning behind the pull request

• StakingV4 integration tests have a "displayer" component which prints the node configuration at every committed block, which is very useful for easy debugging. However, since iteration was done on maps, the shardIDs order and pubkeys order was not determistic, making it a bit difficult to follow node changes during an epoch/block

Proposed changes

• Sorted nodes inside shards and nodes list for a deterministic output

Testing procedure

Pre-requisites

Based on the Contributing Guidelines the PR author and the reviewers must check the following requirements are met:

• was the PR targeted to the correct branch?
• if this is a larger feature that probably needs more than one PR, is there a feat branch created?
• if this is a feat branch merging, do all satellite projects have a proper tag inside go.mod?